Control device for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorShinsuke AOYAGI
Life of this patent
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Abstract
A control device for an internal combustion engine that includes an external EGR device having an EGR passage and an EGR valve installed at an end portion of the EGR passage on the side of a cylinder is configured, when a high intake air pressure condition is met and there is no EGR gas introduction request, to execute an EGR cut control using a variable valve operating device. In the EGR cut control, the control device is configured to open an intake valve during the intake stroke after the EGR valve opens, and adjust an overlap area such that an outflow gas amount via the EGR valve becomes equal to an inflow gas amount via the EGR valve. The EGR passage is configured so as to store a gas that flows out to the EGR passage from the cylinder via the EGR valve during of the EGR cut control.
Claims5
A control device for controlling an internal combustion engine, the internal combustion engine including:
- a supercharger configured to supercharge intake air that flows through an intake air passage;
- an intake valve installed at an end portion of the intake air passage on a side of a cylinder;
- an exhaust valve installed at an end portion of an exhaust gas passage on a side of the cylinder;
- an external EGR device that includes an EGR passage configured to connect the exhaust gas passage with the cylinder, and an EGR valve installed at an end portion of the EGR passage on a side of the cylinder;
- and
- a variable valve operating device configured to change at least one of opening-characteristics of the EGR valve and opening-characteristics of the intake valve,
- wherein an EGR valve lift crank angle period in which the EGR valve opens is provided so as to be located at a part of an intake stroke or to extend from a crank angle position in an exhaust stroke to a crank angle position in the intake stroke,
- wherein the control device is configured, when a high intake air pressure condition in which a pressure in an intake port of the intake air passage is higher than a pressure in an EGR port of the EGR passage is met and there is no EGR gas introduction request for the external EGR device, to execute an EGR cut control by use of the variable valve operating device,
- wherein the control device is configured, in the EGR cut control, to:
- open the intake valve during the intake stroke after the EGR valve opens;
- and
- adjust an overlap area that is an area of a portion in which a lift curve of the EGR valve overlaps with a lift curve of the intake valve such that an outflow gas amount into the EGR passage from the cylinder via the EGR valve becomes equal to an inflow gas amount into the cylinder from the EGR passage via the EGR valve, and
- wherein the EGR passage is configured so as to store a gas that flows out to the EGR passage from the cylinder via the EGR valve during execution of the EGR cut control.
Dependencies are inferred from the claim text.